It won't compost. It won't burn to ash and if you toss them into a garden you will learn that your tiller won't shred them.
As stated, makes good insulation. Not sure how many it would take to stack and cover a wall though...
but you cant stack them after they been squeezed of liquid, not to mention biodegrading rootstocks in your wall. more people have to have some insight...
Hey its a good idea.In 3045 our Gt Gt Gt Gt Gt Gt Gt Gt Gt Gt grand kids will be warm bless there rockwool socks Ha.
Seriously,I use my odd bits fir support some times